Disorder-mediated splitting of the cyclotron resonance in two-dimensional electron systems

E. A. Henriksen, S. Syed, Y. J. Wang, H. L. Stormer, L. N. Pfeiffer, K. W. West

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

We perform a direct study of the magnitude of the anomalous splitting in the cyclotron resonance (CR) of a two-dimensional (2D) electron system as a function of sample disorder. In a series of AlGaAs GaAs quantum wells, identical except for a range of carbon doping in the well, we find the CR splitting to vanish at high sample mobilities but to increase dramatically with increasing impurity density and electron scattering rates. This observation lends strong support to the conjecture that the nonzero wave vector rotonlike minimum in the dispersion of 2D magnetoplasmons comes into resonance with the CR, with the two modes being coupled via disorder.

Original languageEnglish (US)
Article number241309
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume73
Issue number24
DOIs
StatePublished - 2006

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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